DE102016106559A1 - Hand machine tool with a fan wheel - Google Patents

Abstract

Hand machine tool, in particular grinding machine, with an electric drive motor (100) arranged in a motor housing (24) for driving a tool holder (19) for holding a machining tool (20), the drive motor (100) having a stator (110) Excitation coil arrangement (120) and a rotor (101) with a motor shaft (102) having an output (81) for driving the tool holder (19), wherein a fan (109) rotatably connected to the motor shaft (102) or rotatably is coupled, wherein the motor shaft (102) is rotatably mounted with respect to the stator (110) at its longitudinal end regions with an output bearing (105) arranged in the region of the output (81) and an engine bearing (104) arranged at the other longitudinal end region. It is envisaged that the excitation coil assembly (120) between the fan (109) and the output (81) of the motor shaft (102) is arranged and the fan wheel (109) for generating a drive motor (100) from the fan wheel (109) to the output (81) through flowing cooling air flow (K) is configured.

Description

The invention relates to a hand-held machine tool, in particular a grinding machine, having a arranged in a motor housing electric drive motor for driving a holding tool for holding a tool holder, wherein the drive motor has a stator with an exciting coil assembly and a rotor with a motor shaft having an output to Driving the tool holder, wherein a fan wheel rotatably connected to the motor shaft or is rotatably coupled, wherein the motor shaft is rotatably mounted with respect to the stator at its longitudinal end with a arranged in the output drive bearing and an arranged at the other longitudinal end region engine mount with respect to the stator.

Such a hand-held machine tool in the form of a wall and ceiling grinder is, for example, in DE 10 2007 012 394 A1 described.

The fan contributes to the cooling of the drive motor. However, an additional bearing is usually necessary for a fan. In addition, often the air flow of the cooling air flow is not optimal, so that, for example, dust, chips and the like are sucked into the motor housing.

It is therefore the object of the present invention to provide an improved hand machine tool.

To solve the problem is provided in a hand-held machine tool, in particular a grinding machine of the type mentioned that the excitation coil assembly between the fan and the output of the motor shaft is arranged and configured the fan to generate a drive motor from the fan to the output through cooling air flow is.

The advantage of this concept is that the fan wheel forms part of a compressed air fan or represents a compressed air fan, i. that the air is sucked in by the side facing away from the tool holder and is then pressed through the stator, as it were, in order in particular to cool the field coil arrangement. The cooling air is from a relatively clean area, so to speak. There, where relatively little chips, dust and the like are present, sucked so that pollution of the engine is significantly lower or even avoided.

Furthermore, it is advantageous in this concept that the drive motor, for example, only needs two bearings, namely an output bearing near the output and a remote motor bearing. At the same time, the motor bearing forms a bearing for those motor shaft section which is rotationally coupled to the fan wheel or to which the fan wheel is fastened in a rotationally fixed manner. The output bearing can be close to a gearbox, so there is no need for another bearing to support the motor shaft.

In principle, it is conceivable that the output directly drives the tool holder.

However, a concept with a transmission is preferred. Appropriately, it is provided that the output for driving the tool holder is rotatably coupled to a transmission which drives the tool holder. The transmission is or includes, for example, a gear transmission, in particular a bevel gear and / or a speed of the drive motor with respect to the tool holder reducing or increasing gear.

By arranging the drive motor between the impeller and the transmission, for example, seals and / or bearings can be saved.

It is advantageous if the transmission contributes to the encapsulation or the dust protection of the drive motor and / or is itself sealed against dust. Both contribute to the fact that the wear of the hand-held machine tool is lower.

The transmission expediently forms an enclosed module. A preferred measure provides, for example, that the transmission is arranged in an encapsulated, in particular dustproof, transmission housing. The gear housing has, for example, housing parts or housing walls which delimit an interior space of the gear housing in which the movable components, for example gears, bearings or the like, are received in a protected manner. Only at the interfaces to the outside, where the output of the drive motor is arranged or an output for the tool holder and the tool holder itself, openings are present. These openings can also be closed by encapsulated and / or dust-tight bearings. A seal arrangement between the housing parts of the transmission housing, in particular a seal with an O-ring, can form an additional seal of the transmission housing.

Furthermore, it is advantageous if a wall is arranged between the gear and the stator of the drive motor and is sealed with respect to the cooling air flow. The cooling air flow thus does not flow from the drive motor into the transmission. The wall can - as will become clear later - be formed for example by a cover of the motor housing. Furthermore, the wall can also by a housing wall of the Be formed gear housing. Combinations are possible. It may be provided that a housing wall of the gear housing and a cover or a top wall of the motor housing are adjacent to each other and / or each other and form the wall between the gear and the stator.

It is advantageous if there is no distance or fan between the transmission, for example, the transmission housing and the drive motor is advantageous. Thus, it is therefore advantageous if the end face of the drive motor directly adjacent to the transmission, in particular the transmission housing.

Particularly compact is an arrangement in which the output of the drive motor forms a drive wheel, such as a drive pinion of the transmission. The output gear can be formed for example by a toothing, which is arranged directly on the motor shaft, or be arranged directly on the motor shaft.

It is expedient if a transmission housing of the transmission has an insertion opening for the output of the drive motor. At the insertion or other connection between the output and the transmission housing expediently a seal for the output is provided. Thus, the output can be dustproof connected to the transmission.

It is preferably provided that the motor housing between the output bearing and the excitation coil arrangement arranged outflow openings for the cooling air flow. In this context, it may be advantageous if only such outflow openings are present, that is, that no outflow opening is present in the longitudinal direction in front of the output bearing.

In particular, it is preferable if outflow openings for the cooling air flow are provided exclusively between the output bearing and the exciter coil arrangement. These outflow openings are preferably arranged and / or configured radially with respect to the motor shaft. The cooling air flow thus flows from the engine mount in the direction of the output bearing, but not immediately past this, which for example may help to reduce or avoid contamination or other impairment of the output bearing by the cooling air flow.

It is preferred if the outflow openings in total or at least one outflow opening for the outflow of the cooling air flow are arranged and / or configured radially with respect to the motor shaft. Thus, the cooling air flow flows out of the motor housing not or not only axially along the longitudinal axis of the motor shaft, but radially outward.

It is preferred if at least one outflow opening or all outflow openings for discharging the cooling air flow are directed to a working region of the hand-held machine tool, so that the cooling air flow flowing out of the at least one outflow opening or outflow openings at least partially blows the working area freely. It is preferred if the outflow openings or the at least one outflow opening are directed forward in the working direction of the hand-held machine tool. Furthermore, it is advantageous if the working area can also be laterally freiblasbar by the cooling air flow. For example, the outflow openings extend over an angular range of the motor housing such that both the working area directly in the direction of forward in front of the hand-held machine tool can be freely blown by the cooling air flow, as well as in an angular range of for example 10-40 ° laterally to a forward in the working direction directed axis line. In particular, it is advantageous if the outflow openings are arranged in an arcuate manner around the motor shaft, in particular in a peripheral region of 30-180 ° of the motor housing.

It is advantageous if the outflow openings are radially spaced from an outer circumference of the stator. For example, outflow openings arranged on the motor housing have a distance to an outer circumference of the stator, which corresponds to at least half a radius, preferably approximately a complete radius, of the outer circumference of the stator to the motor shaft. The resulting space between the stator and outflow openings or motor housing can be used for example for electrical cables, protective circuits and the like. These are cooled at the same time.

A particularly easy-to-implement bearing concept provides that as few bearings as possible are required in the drive motor. For example, it is advantageous if the motor shaft is mounted on exactly two bearings and / or based solely on the engine mount and the output bearing. Further bearings are not available in this case. In particular, it is advantageous if the fan does not have to be supported by a separate bearing, but is arranged directly on the motor shaft and supported by the engine mount. For example, the fan is not located between the engine mount and another camp. However, it is quite possible that at least one additional bearing is provided for the fan wheel bearing.

When the rotor is accommodated in a rotor receptacle of the stator, it is preferred that at least one longitudinal end portion of the motor shaft, expediently both longitudinal end portions of the motor shaft, is dustproof or sealed from the environment.

For example, a labyrinth seal may be provided between the stator and the rotor. For example, there is a flow labyrinth between the rotor and the stator, so that the cooling air can not or only insignificantly flow in a gap between the rotor and the stator.

Furthermore, it is advantageous for sealing the rotor accommodating space when the output bearing and / or the motor bearing are arranged on a bearing cap and the bearing cap itself and / or each held by the bearing cap output bearing or motor bearings, the rotor receptacle of the stator, in which the rotor is accommodated closes , preferably dustproof. A combination is thus readily possible, that is, that both the bearing cap and the respective bearing cause a tightness. Furthermore, it is also possible to provide the aforementioned labyrinth seal between the rotor and the stator. As a bearing cap, for example, an end cover of the rotor receptacle is understood, to which the longitudinal axis of the motor shaft extends at an angle. The bearing cap may be integral with a stator body of the stator, i. that the rotor receptacle is configured, for example, as a depression on the stator body. Preferably, at least one of the bearing caps is designed as a component mounted on the stator body.

An advantageous concept provides that the output bearing and / or the motor bearings are designed as sealed or dust-tight bearings. For example, corresponding sealing washers or sealing rings are provided. An advantage is also when the output bearing or the motor bearing or both the above-mentioned rotor receptacle, in which the rotor is accommodated within the stator, tight, in particular dust-tight, close. Thus, therefore, the two bearings or one of the bearings contribute to the dust-tightness of the rotor mount advantageous.

It is useful if the air flowing into the motor housing to the drive motor air is filtered. It is preferably provided that the motor housing in the region of the fan wheel, for example on a housing cover provided there, has an inflow opening, on which a holder for releasably holding a filter element is arranged. The filter element is used for filtering air flowing through the inflow opening. For example, the filter element comprises a paper filter and / or a filter grid and / or a filter fabric or the like. At the inlet opening, in addition to or as an alternative to the filter element, an inlet grid, for example comprising a plurality of ribs, may also be provided. The inlet grille can serve as a support for the filter element.

The holder expediently comprises a retaining clip with which the filter element can be held. The filter element may comprise the holding trough integrally.

Furthermore, it is expedient if the holder comprises latching means for latching with the motor housing.

The motor housing preferably forms a machine housing of the hand-held machine tool. Preferably, the motor housing or machine housing is the outermost or outer component, so to speak. Thus, therefore, the machine housing is not included in an additional housing, which einhaust it. For example, the motor housing is a machine housing of a machining head of the hand-held machine tool.

Appropriately, it is provided that in the motor housing, a flow housing or an air guide body or both are arranged to guide the cooling air. The flow housing or the air guide body are, for example, sleeve-like. Preferably, the stator is at least partially received in the flow housing or air guide body. The flow housing or the air guide body are preferably provided to pass the cooling air on the outer circumference of the stator or the exciting coil assembly.

At this point, it should be noted that the excitation coil arrangement preferably has air channels for the passage of cooling air between their excitation coils.

The hand-held power tool expediently has a rod-shaped handle element for gripping by an operator and a machining head movably mounted on the handle element via an articulated arrangement, which has an electric drive motor for driving a tool receptacle provided for holding a machining tool.

Advantageously, it is provided that the drive motor is a brushless motor and at a distance from the drive motor on the handle element an energizing device for the drive motor is arranged, which is connected via a line arrangement with the drive motor.

An advantage of this concept is that the brushless motor has an optimal power output with relatively low weight. It is also optimized by means of the energizing device in Reference to power output and / or speed can be energized.

Advantageously, a speed-reducing transmission is arranged between the drive motor and the tool holder for a speed reduction of a rotational speed of an output of the drive motor relative to a rotational speed of the tool holder. It is advantageous that a gear is arranged directly on the machining head, via which the tool holder is driven. The transmission is a transmission which reduces a speed of the drive motor, in particular a toothed transmission. This allows the drive motor to rotate with respect to the tool holder higher speed, which is reduced from the gearbox to the tool holder, at the same time the torque of the tool holder is larger. As a result, a smaller, more compact drive motor can be used whose torque is smaller than the torque delivered to the tool holder.

In addition to the function to reduce the speed of the drive motor relative to the tool holder, the transmission can also fulfill other functions or include corresponding transmission components. For example, it is advantageously possible for the transmission to comprise a transmission producing a hypercycloidal movement or superimposed rotational movements of the tool holder and / or a gearbox producing an eccentric movement of the tool holder or having corresponding gearbox components. Thus, for example, an eccentric gear and / or a hypercycloid gear can be part of the transmission or connected to the transmission.

An alternative designation for the brushless motor is "electronically commutated motor" or EC motor, also brushless DC motor, (BLDC or BL motor). The brushless motor has no sliding contacts or brushes. Between a housing fixed excitation coil assembly or a stator of the brushless motor and its rotor no electrical connections are necessary, such as slip rings, brushes or the like. The brushless motor does not wear out or at least significantly less than a conventional universal motor or commutator motor.

At least one sensor, for example a magnetic or optical sensor, may be provided on the drive motor for detecting a rotational angular position of the rotor relative to the stator or rotor position relative to the stator.

The energizing device comprises, for example, a so-called electronic commutator.

The commutation is preferably sensorless, that is to say that no sensors for detecting a rotor position are necessary on the drive motor itself or its exciter coil arrangement, for example magnetic sensors for detecting the magnetic flux of the rotor, optical sensors or the like. Furthermore, no data line for transmitting sensor signals of a sensor, which is arranged directly on the drive motor, to the energizing device necessary. If the lighting device and the drive motor are far away from each other, simplified cable routing is possible.

But it is also a sensor or sensor-controlled commutation of the energizing readily possible. In this case, then at least one sensor on the drive motor is present, which detects a rotational angular position of the rotor with respect to the stator or the excitation coil arrangement and reports via a data line to the energizing device as a data signal.

It is advantageous if the lighting device is arranged directly next to or on a handle region for gripping the handle element by an operator. The energizer may also be located, for example, between two handle areas that are typically grasped by the operator, for example, when the operator guides the handheld machine tool with two hands or two hands. The handle areas are advantageously provided on handle bar sections of a handle bar, between which the energizing device is arranged.

It is advantageous if the energizing device is arranged in a housing. The housing is arranged, for example, on a handle bar of the handle element.

The power supply device comprises, for example, an arrangement of a plurality of half bridges and / or a plurality of power electronic switches, for example MOSFETs or the like. Furthermore, the energizing device may comprise, for example, an electrical transformer and / or other components for processing a mains voltage or a voltage of an energy store. These components have a considerable weight in practice.

The arrangement of the energizing device on the handle element results in a favorable center of gravity position, that is, a housing having the Bestromungseinrichtung can be taken directly by the operator or is located close to a handle area, which is usually used by the operator in the operation and use of the hand-held machine tool becomes.

Expediently, the hand-held power tool has a connection device for connection to an electrical energy supply network, in particular an AC voltage network. As part of a treatment of a supply voltage of the power supply network, the energizing device converts, for example, the AC voltage in a DC link DC voltage.

Alternatively or additionally, it is also possible for the hand-held power tool to have an energy store connection for an electrical energy store, for example a battery pack, a fuel cell or the like. As a result, the hand-held power tool can be operated independently of a power supply network.

A preferred concept provides that the line arrangement for each phase of an excitation coil arrangement of the drive motor in each case comprises conductors or exactly one conductor. Thus, for example, a total of three conductors or exactly three conductors can be provided in the case of a three-phase excitation coil arrangement to be controlled. A number of phases of the drive motor thus preferably corresponds exactly to a number of conductors of the line arrangement. However, the drive motor can also have only one or two phases or more than three phases, for example six phases. In this case, then a conductor, two conductors or six conductors are provided in the line arrangement. It is conceivable in each of the previous configurations, however, that even an additional grounding conductor forms a part of the line arrangement and serves as a return conductor for the current-carrying, provided for energizing the exciter coil assembly conductor. In any case, it is advantageous if the line arrangement comprises only a few lines or conductors. This facilitates, for example, a shielding of the line arrangement and / or contacts between sections of the line arrangement, namely, if the handle element is multi-part, for example, each other releasable and / or movably mounted on each other handle elements.

The line arrangement thus expediently comprises lines provided exclusively for energizing the drive motor.

It is preferred if the lines which supply the phases of the exciter coil arrangement with power are shielded by one or more electromagnetically shielding shielding devices. For example, the lines run in an electromagnetically shielding hose or braid. It is easily possible to individually shield each of the lines electromagnetically. It is advantageous, however, if several lines are shielded together. However, individually shielded lines can also run through a shielding device which shields at least two lines in common. The at least one shielding device protects the surroundings of the line arrangement from electromagnetic influences and, conversely, the line arrangement from electromagnetic influences from the environment.

It is possible for the line arrangement to comprise at least one data line or for at least one data line to run between the processing head and the lighting device. By way of example, one sensor signal or a plurality of sensor signals from at least one sensor can be transmitted to the drive motor via a data line. The sensor signal can originate, for example, from a sensor which transmits a temperature and / or rotational speed and / or a rotational position of the rotor of the drive motor or another functional variable of the drive motor to the current-supplying device. Such a data line may for example form part of the line arrangement.

Between the drive motor and the energizing device, however, preferably expediently no data line serving exclusively for data transmission and not for energizing the drive motor. Thus, therefore, the wiring can be limited, for example, those current-carrying lines that are necessary for energizing the field coil assembly of the drive motor. It is therefore particularly preferred if no data line is necessary.

It is advantageously provided that the energizing device and the drive motor each have a cooling device, for example one or more fans. Thus, therefore, a cooling of the energizing device is independent of a cooling of the drive motor. The cooling devices work independently of each other, so that, for example, the energizing device and the drive motor can be cooled individually and as needed. Due to the distance between the power supply and tool holder, which is close to the drive motor, there is the advantage that, for example, by the use of the machining tool resulting dust, chips or the like can not get directly into the energization, so that they there, for example, pollute the cooling device or fan , It is also advantageous if a fan is rotatably mounted on the motor shaft of the drive motor. Thus, the drive motor drives its fan itself, so to speak.

The distance between the energizing device and the machining head is preferably relatively long. For example, this distance at least twice or three times as large as a diameter of the machining head. Another possibility for expressing this greater distance is when it is provided that the distance between the energizing device and the machining head corresponds at least twice or three times to the length of the energizing device and / or its housing.

It is advantageous if the drive motor is arranged in a housing which shields it electromagnetically.

An energy storage connection for an electrical energy store, for example a battery pack, and / or a connection device for connecting to an electrical energy supply network, for example 220-240 V or 110-120 V or another AC voltage network, is advantageous in the hand-held power tool.

It is advantageous if a rotation axis of the output of the drive motor and a rotation axis of the tool holder are parallel to one another. In this case, the transmission does not need to realize any angular deflection, that is, for example, an angle gearbox that is relatively loud in itself is not necessary. In addition, transmission components are saved. But it is also possible that the axis of rotation of the output and the axis of rotation of the tool holder are oriented at a small angle to each other, for example, a maximum of 10 ° or a maximum of 20 ° or a maximum of 30 °.

In particular, it is expedient for the drive motor to project upwards in front of an upper side of the machining head facing away from the machining side of the machining tool.

Preferred is a configuration in which the drive motor does not protrude over a processing surface, such as a grinding surface, polishing surface or the like, of the processing tool to the side or transverse to the axis of rotation of the tool holder. Furthermore, it is expedient if the drive motor does not project beyond a cover, for example a protective hood or suction hood, for the machining tool transversely to the axis of rotation of the tool holder.

Conveniently, the drive motor is arranged outside a center of gravity or center of the machining head. Preferably, the drive motor is provided so to speak off-center on the machining head.

Advantageously, it is provided that the drive motor is arranged next to at least one pivot axis of the joint arrangement on the machining head. This pivot axis is preferably a transverse to the longitudinal axis of the handle member pivot axis. This can contribute to the fact that the machining head is free to move relative to the handle element. An advantageous arrangement provides that the pivot axis, adjacent to which the drive motor is arranged, extends between the drive motor and a line arrangement connected to the machining head.

It is also possible that the drive motor is arranged in a plane of another pivot axis of the joint arrangement, for example a transverse to the aforementioned pivot axis, in particular at right angles transverse pivot axis. In this plane, for example, the longitudinal axis of the handle member is provided.

An independent invention in connection with the preamble of claim 1, but also an advantageous development of the previous measures represents the following:
Preferably, the drive motor is arranged in a motor housing, on which at least one protective body is provided for damping a mechanical shock acting on the motor housing. In front of the motor housing may alternatively or additionally also be arranged at least one guard to protect the motor housing from mechanical stress. Thus, the drive motor or its motor housing is advantageously protected against impacts and other mechanical effects.

The protective body may be, for example, an impact absorber.

Conveniently, the protective body consists of an elastic material, for example a resilient plastic material and / or rubber.

Preferably, the protective body has an annular shape.

The protective body is expediently arranged on a region of the motor housing facing away from a machining side of the machining head. For example, it is configured and arranged there as a kind of protective boot, as a guard ring or the like. Preferably, the protective body is designed as a detachable from the motor housing plug-in component, which is attachable to a socket of the motor housing. On the motor housing a plug-in receptacle is accordingly provided. Advantageously, a jamming and / or locking of the protective body to the motor housing is present, that is, there are clamping means and / or locking means are provided. If necessary, the protective body can then easily be replaced, for example, against a more elastic protective body or an undamaged protective body.

Appropriately, it is provided that on the drive motor, a protective circuit is arranged with at least one electrical circuit breaker for disconnecting a connection between at least one electrical line of the line arrangement and a supplyable via this line with power phase of an exciting coil assembly of the drive motor.

It is a basic idea that a disconnect switch is provided locally on the drive motor, which can electrically deactivate an electrical line of the line arrangement. The energizing device can therefore supply the excitation coil arrangement with current without special monitoring, so that the rotor of the drive motor rotates. However, if a fault occurs on the drive motor, such as overheating or the like, the circuit breaker switches off locally and directly on the drive motor, the power supply of this one phase, which is associated with the circuit breaker, so that the drive motor is protected. It is understood that not only a circuit breaker, but quite a number of disconnectors can be present. For example, a switch can be provided between each two separate lines and the separate phases of the excitation coil arrangement supplied by them. Thus, each of these phases is separable from the supply line by a circuit breaker or electrically isolable.

A possible data line or sensor line from the drive motor to the lighting device, via which faults in the drive motor of the lighting device can be reported, is not necessary.

The concept works very fast, i. that the respective disconnect switch actively switches even before a possible destruction or damage of the drive motor and / or separates the electrical power supply for its associated phase. Any loss of time due to the fact that the power supply has to detect a fault in the drive motor and then only turns off the power supply, are not to be feared.

Preferably, at least one of the circuit breakers or the circuit breaker to a thermally actuated switch which separates in dependence of a predetermined temperature, the line from its associated phase of the exciting coil assembly. Thus, if the drive motor threatens to overheat, the circuit breaker shuts off the power supply for its associated phase. The thermally actuated switch comprises, for example, a bimetallic switch. This advantageously comprises a bimetallic element which directly connects or disconnects electrical contacts of the circuit breaker and / or has at least one electrical contact.

However, the circuit breaker may also be an electrically actuated switch or comprise such a switch, which separates the line from its assigned phase when a predetermined voltage and / or a predetermined current flow is exceeded. For example, the switch detects a current flow through a coil of the coil assembly, which is powered by the line, or a current flow in the line itself. Furthermore, the switch can also detect a voltage, so that, for example, in the case of an overvoltage above a predetermined value Switch the line and its associated phase separated from each other.

It is understood that a combination of switches to form the circuit breaker is possible or that a circuit breaker may be provided which has a plurality of functions, i. for example, is thermally and electrically actuated. For example, different functional switches may be connected in series so that the line or phase to be monitored is disabled in the event of multiple types of interference, i. both in the case of overheating (thermal shutdown) and, for example, in the case of an electrical hazard situation (shutdown / disconnection in case of excessive voltage or too high current).

It is possible that the circuit breaker is not only connected between a line and its associated phase, but between two or more lines and their associated phases. The circuit breaker is thus configured in this embodiment, preferably for separating electrical connections between at least two electrical lines of the line arrangement and over these lines can be supplied with power phases of the exciting coil arrangement. The circuit breaker thus has, for example, electrical contact pairs, of which in each case one pair of contacts is connected between an electrical line and the phase of the field coil arrangement supplied by this line.

Furthermore, an arrangement with two or more circuit breakers is possible, which are connected, for example, in series or series one behind the other and between the line and its associated phase. It may be readily provided with two or more phases of the exciting coil assembly such series circuits of disconnectors.

As already mentioned, several circuit breakers can also be actuated differently. For example, an arrangement of two or more circuit breakers comprises a circuit breaker operable by a first physical, for example, thermal, action, while the other circuit breaker is operable by a second physical action, such as an electrical action (current, voltage, or the like).

It is preferred if the at least one circuit breaker is arranged on a stator, for example a laminated core, of the drive motor. But would also be an arrangement of the circuit breaker directly to the excitation coil assembly of the drive motor, for example, for detecting a current flow or voltage. Due to the arrangement directly on an exciter coil but also overheating can be detected very quickly by the circuit breaker.

A preferred concept provides that the at least one circuit breaker is arranged in a protective housing. Thus, the circuit breaker is protected, for example, from mechanical damage. The protective housing may be multi-part, that is, for example, have a housing base and a housing cover, so that it can be easily opened and closed. The housing parts of the protective housing are preferably locked together or latched. The protective housing preferably has a receiving chamber in which the circuit breaker is completely received, i. encased from all sides. The protective housing may also be a partial housing, which covers the circuit breaker, for example, wherein the circuit breaker is preferably attached directly to the drive motor with one side, for example, the stator.

The protective housing has expediently two housing parts, for example a thermally conductive housing part and / or a thermally insulating housing part, between which the circuit breaker is arranged. The thermally conductive housing part is arranged on the drive motor, while the thermally insulating housing part is provided on a side facing away from the drive motor side of the protective housing. In this way, for example, heat from the drive motor is passed to the recorded in the housing disconnector. External heat that might otherwise cause the circuit breaker to undesirably, i. could operate the circuit breaker to disconnect the conductor between the phase and the exciting coil assembly, is thus prevented from the protective housing.

Furthermore, it is advantageous if the circuit breaker, in particular the protective housing, is thermally and / or electrically insulated on a side facing away from the drive motor. For example, the protective housing there has a corresponding thermally insulating plastic material. Even without a protective housing, it is possible to realize such a thermal or electrical insulation. For example, an encapsulation or a cover with a correspondingly insulating plastic on the circuit breaker could serve as thermal and / or electrical insulation.

An advantageous concept provides that between the at least one circuit breaker and an electrical or mechanical component of the drive motor, for example, the stator or exciting coil, a heat conducting element is arranged. The heat-conducting element is designed, for example, as a cushion or as a pad. The heat-conducting element is arranged, for example, over the entire surface or essentially over the full area between the protective housing and the mechanical component of the drive motor.

It is preferred if the circuit breaker is loaded by a spring arrangement, for example a spring, in the direction of a component, for example of the stator, of the drive motor. Thus, the circuit breaker is pressed, for example, for a thermally optimal transmission in the direction of the stator or the other component by the spring assembly.

As already mentioned, a heat-conducting element can be provided between the disconnecting switch and the drive motor. Preferably, this or another compensation means for producing a substantially full-surface contact between the circuit breaker and a component, for example, the stator, the drive motor is provided.

It is preferred if the energizing device has a current monitoring device for detecting a current flow on the line connected to the at least one disconnecting switch. Thus, for example, if the circuit breaker disconnects the current flow between this line and the phase of the field coil arrangement, no current will flow.

It is advantageous if the energizing device is designed to switch off further lines, in particular of all lines between the energizing device and the drive motor, as a function of a current flow via the line connected to the at least one disconnecting switch. Thus, for example, if the current monitoring device detects that no more current flows through the line which is disconnected from the circuit breaker to the stator or the exciter coil arrangement, it also shuts off the remaining lines. It is advantageous if the power supply device, when the disconnect switch goes to the disconnected position, completely shuts off.

The power supply device has, for example, a microprocessor control which can respond to such operating conditions. A microprocessor of the microprocessor control carries e.g. Program code of a control program for controlling the power supply from.

It can also be provided that the energizing device recognizes, for example based on a switching behavior of electronic switch their commutation that the at least one circuit breaker has gone into the disconnected position, ie the phase of the exciting coil associated with him has separated from the associated line.

The hand-held power tool preferably has a handle rod with a longitudinal axis or comprises such a handle rod, wherein the suction hose runs in the connection region with the end region of the handle element along this longitudinal axis. For example, a flexible suction hose can be arranged on the handle bar. But it is also possible that the handle element has a rigid tube body, in which runs with the suction hose to the processing head out in flow connection suction. The tubular body can be configured for example as a profile tube, in particular as a rigid profile tube. The tubular body is suitable in this case for gripping by the operator. Thus, therefore, the profile tube forms a supporting body or a stable component of the handle element.

The handle element expediently has at least one suction channel, which extends in the direction of a longitudinal axis of the handle element, for example in the abovementioned flexible suction hose or the tubular body, and opens out of the handle element at its end region of the handle element facing the machining head. There, the suction hose is connected to the processing head with the suction channel.

Preferably, however, the handle element is configured as a suction tube at least at its end region facing the machining head or has a suction tube. With this suction pipe, the suction hose, which leads to the machining head, connected.

The hand machine tool is preferably a grinding machine, polishing machine or milling machines. In particular, the hand-held power tool is preferably equipped with handle element which protrudes from the machining head or motor housing.

The handle element may be in one piece or in several parts. Preferably, the handle element is or comprises a handle bar. The handle bar may be a one-piece component or has a plurality of rod sections which are detachable from each other and / or movable relative to each other by means of bearings, so that the handle bar can be disassembled when not in use and / or folded into a compact form.

Hereinafter, an embodiment of the invention will be explained with reference to the drawing. Show it:

1 a perspective view of a grinding machine, of which in

2 a machining head, for example a grinding head, is shown in perspective,

3 a side view of the grinding machine with befindlichem in a base position machining head, in partial views according to

4 in a first, adjusted from the base position deflection position and

5 is shown in a second, displaced from the base position deflection position,

6 a side view of the machining head,

7 an exploded view of a drive of the machining head of the grinding machine,

8th the processing head of the grinding machine with a hinge assembly in exploded view,

9 the joint arrangement of the grinding machine in an exploded view,

10 a drive motor of the grinding machine with a protective circuits in exploded view,

11 a cross section through the drive motor according to 6 approximately along a section line AA,

12 an upper portion of a motor housing of the machining head obliquely from behind,

13 a perspective oblique view from above of a motor assembly of the machining head with the drive motor, of which in

14 a cross-sectional view, approximately along a section line FF in 13 , is shown

15 a drive circuit for the drive motor,

16 Handle rod parts of a handle bar for the grinding machine in not yet plugged state in perspective obliquely from above

17 the arrangement according to 16 , but in mated condition,

18 perspective detailed representations of the in the 16 and 17 handle bar parts shown.

The embodiment relates to a hand machine tool 10 in the form of a grinding machine, however, with respect to some aspects of the following description, other embodiments of hand tool machines are also possible, for example milling machines, polishing machines or the like. Furthermore, an elongated handle element is shown in the embodiment, which can be quite shorter or longer. The hand machine tool according to the drawing is advantageous for ceiling work or wall processing. You can use the hand machine tool 10 also refer to a ceiling and / or wall grinder according to the drawing. Aspects of the following remarks do not necessarily relate exclusively to grinding machines, polishing machines or milling machines, but can also be applied to other hand-held machine tools.

The hand machine tool 10 has a machining head 11 which is attached to a handle element 12 by means of a joint arrangement 13 hingedly mounted, although not push-movable in the present case, which would be possible in principle, but at least one pivot axis, in the concrete embodiment, even to two pivot axes. The handle element 12 is designed rod-shaped. It has a longitudinal extension or longitudinal axis L. The elongate handle element 12 allows the machining head 11 at a large distance from the user on a workpiece surface O of a workpiece W, for example, a wall surface, along to lead.

The joint arrangement 13 stores the machining head 11 with respect to the handle element 12 based on a first pivot bearing 14 about a first pivot axis S1 and based on a second pivot bearing 15 about a second pivot axis S2. On the basis of the pivot bearing 14 . 15 can the machining head 11 relative to the handle element 12 to pivot about the two pivot axes S1 and S2, wherein the pivot axes S1 and S2 are at a right angle to each other. In principle, however, other than right angles would be conceivable. The pivot bearings 14 . 15 advantageously form a gimbal.

The pivot axis S1 extends transversely, in this case at right angles transversely, to the longitudinal axis L of the handle element 12 , The pivot axis S2 and the longitudinal axis L are advantageously arranged in a common plane or in mutually parallel planes. The pivot axis S2 and the longitudinal axis L do not intersect in the present case.

The machining head 11 has a support body 16 on which a drive motor 17 is held. The drive motor 100 drives directly or in the present case via a gearbox 80 a tool holder 19 about a rotation axis D on. The tool holder 19 is for holding a machining tool 20 provided in the on the tool holder 19 mounted state by the drive motor 100 can be driven to a rotational movement. The tool holder 19 For example, includes a plug-in receptacle, bayonet contours, a screw thread or the like other known per se mounting means for mounting a machining tool.

At this point it should be mentioned that instead of or in addition to the rotational movement of the tool holder 19 Also, for example, an oscillating movement in another embodiment of an embodiment is possible. Furthermore, superimposed rotational movements, for example, hypercycloidal rotational movements of the tool holder 19 be realizable, in which case the transmission 80 configured differently according to, for example, has an eccentric gear.

The editing tool 20 in the present case is a grinding tool, in particular a grinding plate. The editing tool 20 may include several components, such as a sanding pad to which a grinding wheel or an abrasive sheet can be arranged. For this purpose, for example, a Velcro connection between the sanding pad and the sanding sheet is advantageous.

By designed as a grinding tool machining tool 20 forms the hand machine tool 10 a grinding machine 10A , The machining head 11 could also be described as a grinding head. The elongated, rod-shaped handle element 12 facilitates handling of areas remote from the operator, such as wall surfaces. The hand machine tool 10 preferably forms a wall and / or ceiling grinder. However, the embodiments explained below are also applicable to a multiplicity of differently designed hand-held machine tools, in particular grinding machines, but also saws, drills or the like advantageous.

The tool holder 19 and therefore the editing tool 20 when it comes to the tool holder 19 are fastened, are preferably under a cover of the machining head 11 arranged. It would be possible, for example, that the cover 21 the editing tool 20 covering over its entire outer circumference and upper side. Here is a respect to the cover 21 movable cover 22 , For example, on a front, free and the handle element 12 remote area of the machining head 11 intended. The cover 22 is for example from the cover 21 removable and / or based on a bearing movable to the cover 21 stored, for example, a parallel to the pivot axis S2 pivot axis. A plug-in mounting of the cover 22 on the cover 21 sees, for example, plug-in projections 22B , for example, in front of insertion tabs in plug-in receptacles 21B the cover 21 can be inserted, especially with the plug-in receptacles 21B are latched.

At the outer edge of the cover 21 . 22 can a seal 22A , So sealing elements, for example, brushes, sealing lips or the like other preferably on the workpiece surface O adjusting sealing elements, be provided. It is possible that the editing tool 20 in front of the seal 22A protrudes.

The cover 21 . 22 is for example on an underside of the support plate or the support body 16 attached or with the support body 16 integral. On an upper side, so from the tool holder 19 turned away, are on the support body 16 a motor housing 24 for the drive motor 100 and a suction connection 23 arranged.

At the of the tool holder 19 facing away from the top of the motor housing 24 is an air inlet or inlet 25 for admitting the drive motor 100 Cooling cooling air arranged. The cooling air K flows, for example, over an air outlet area 18 of the motor housing 24 out of this. For example, the air outlet area is located 18 at one to the inflow opening 25 angular, for example, on the outer circumference of the motor housing 24 intended area. In principle, it would be possible for the cooling air K to pass through the covers 21 . 22 enclosed area flows and there, for example, to cool the machining tool 20 or also contributes to dissolving dust.

The air outlet area 18 extends both in a working direction AR forward, as well as laterally thereto, for example, over an angular range of about 90 ° laterally to the working direction AR. The cooling air K can therefore blow a working area AB extending in the working direction AR forward and laterally to the working direction AR.

About the suction connection 23 Can get out of the through the covers 21 . 22 Covered or covered area dust, dirt or chips are sucked off. The suction connection 23 has, for example, a nozzle 23A on.

To the suction connection 23 is a suction hose 26 with a hose end 28 connected with his other hose end 27 with the handle element 12 connected is.

The connection of the hose ends 27 . 28 with fixed structures, for example the suction connection 23 and the handle element 12 , is through structuring 29 , for example corrugations, on the hose elements 27 . 28 improved. For fixing the hose end 28 with the suction connection 23 is for example a clamp 30 provided by a screw 30A in one the hose end 28 with the neck 23A clamped clamping position can be brought. At the other end of the hose 27 are for example a sleeve-shaped connection part 31 and a connecting piece 32 for connection to a rod-shaped channel body 33 the handle element 12 provided so that one from the suction port 23 outflowing laden with dirt suction flow S in a flow channel 34 of the handle piece 33 can flow.

The rod-shaped, elongated channel body 33 extends between the hinge assembly 13 and a handle section 35 the handle element 12 , The handle section 35 is between the channel body 33 and a channel body 36 arranged, on which a suction connection 37 is provided for connecting a suction hose C. The suction hose C can, for example, based on a mounting arrangement 38 with the channel body 36 get connected. The mounting arrangement 38 For example, includes a clamp, a hook assembly or the like.

At the handle section 35 is a switch 39 for switching on the drive motor 100 intended.

In the area of the handle section 34 is a lighting device 40 for energizing an excitation coil arrangement 120 of the drive motor 100 arranged.

About a power cord N, which may for example be arranged on the suction hose C or integrated into the suction hose C, which is Bestromungseinrichtung 40 to an electrical supply network V or another power source connected. The other power source may be, for example, a battery pack or other energy storage on board the hand-held power tool 10 can be.

About diodes D1, D2, D3 and D4 of a rectifier G, the power supply 40 For example, from a supply voltage V provided by the AC voltage in a known manner generate a DC voltage UG to ground or a base potential U0, between the potentials UG and U0 advantageously a capacitor C1, for example, a smoothing capacitor or DC link capacitor is arranged.

On lines with the potentials U1, U0 is an output stage E, for example, a commutator, connected via lines L1, L2 and L3 exciter currents I1, I2 and I3 for the drive motor 100 provides. The output stage E includes, for example, switch pairs with power electronic switches, for example MOSFETs V1, V2 and V3, V4 and V5, V6 between which the respective lines L1, L2 and L3 are connected in the manner of half-bridges.

The switches V1-V6 are controlled by a controller 170 controlled by control lines, not shown. The control 170 monitored for example by means of a current monitoring device 171 the current flow on the line L1. Without further measures, further current monitoring device could be provided, for example for the lines L2 and L3. The current monitoring device 171 For example, has a corresponding inductance to detect the flow of current on the line L1.

The control 170 suitably includes a control program 173 which is controlled by a microcontroller 172 the controller 170 executable program code. By executing this program code, the controller can 170 the switches V1-V6 suitably drive to a speed and / or power output of the drive motor via a corresponding current flow on the lines L1 to L3 100 adjust. But also the switching behavior of the switch V1-V6 can for the control 170 be an indication that no current flows over one or more of the lines L1 to L3.

The line arrangement 41 includes an electrical cable 42 in which the lines L1, L2 and L3 are arranged. The cable 42 runs from the handle section 35 starting in the channel body 33 or outside of the channel body 33 and ends at the processing head 11 facing end portion of the channel body. From there the cable runs 42 free up to the drive motor 100 ,

At the handle section 34 is a housing 43 provided in which the energizing device 40 is arranged. The energizing device 40 in addition to the power electronic components expediently also mechanical components, such as coolant. Thus, the energizing device therefore has 40 a certain weight, however, during operation of the power tool 10 does not bother. The energizing device 40 namely, is directly on the handle part 34 arranged where the operator the handle element 12 regularly grabs at least with one hand. Thus, with respect to the electric drive technology acts only the drive motor 100 in the sense of a lever on the handle section 34 , while, so to speak, the preparation of the current for the drive motor 100 with favorable center of gravity directly in the handle portion of the handle element 12 lies.

The arrangement of the relatively dirt-sensitive or dust-sensitive electronics in the handle section 34 Also has the advantage of being as far away from an area of the hand machine tool as possible 10 is where dust accumulates, namely at the machining head 11 , Thus, for example, by inlets 44 of the housing 43 incoming air, preferably still by coolant, for example a fan 45 , is promoted to a special degree, due to the great distance to the machining tool 20 little burdened with dust.

For a favorable handling of the hand machine tool 10 contributes to that of the drive motor 100 and the suction connection 23 on opposite sides of a hinge region 46 of the machining head 11 are arranged, wherein the joint arrangement 13 at the articulation area 46 with the processing head 11 articulated is connected. The suction hose 26 has between the free end of the handle element 12 where he is connected to this, and the machining head 11 Arch sections, in particular two oppositely bent arc sections 47 . 48 so that he knows the movements of the machining head 11 relative to the handle element 12 Join in comfortably. This becomes clear in the 3 . 4 and 5 ,

The tool holder 19 is at a machining side BS of the machining head 11 arranged. In a base position B of the machining head 11 relative to the handle element 12 are the machining side BS and a bottom UH of the handle member 12 facing the workpiece W.

Starting from the base position B ( 3 ), the machining head 11 between deflection positions A1 ( 5 ) and A2 ( 4 ) pan. The deflection positions A1, A2 are expediently maximum positions, with pivoting beyond these deflection positions A1, A2 also possible is. Is the suction hose 26 beyond the deflection positions A1 and A2 to deflect or deform to an even greater extent, it forms expediently a resilient stop for the deflection positions A1 and A2.

The base position B, together with the deflection positions A1 and A2 and possibly further deflection positions beyond these deflection positions or intermediate deflection positions between the deflection positions A1 and A2, form part of a base working range BA of the manual power tool 10 , It is pivoting beyond the deflection position A2 that the machining side BS and an upper side of the handle element 12 a workpiece W, quite possible. Then there is the machining head 12 for example in an additional work area ZA.

In the deflection position A1, for example, a machining plane E of the machining tool extends 20 approximately parallel to the longitudinal axis L, while in the deflection position A2, the working plane E is approximately at right angles to the longitudinal axis L.

At that the processing head 11 holding end portion of the handle member 12 , So here the channel body 33 , is a fork 50 arranged between their fork arms 51 . 52 the machining head 11 is mounted pivotably about the pivot axis S1. The fork arms 51 . 52 are at a holding section 53 designed in the manner of half-shells, between which a holder 54 or a receptacle for the handle element 12 , in particular their channel body 33 , is formed.

The holder 54 for example, between walls 55 the fork arms 51 . 52 formed, for example as a round recording contour. As anti-rotation and / or displacement protection with respect to the longitudinal axis L of the handle element 12 serve support structures 58 the fork 50 , in particular through the screw domes 57 can be formed. In the support structures 58 , For example, form-fitting projections, engage support structures 33A the handle element 12 a, for example, on the outer circumference of the channel body 33 provided depressions, in particular grooves or longitudinal recesses. The support structures 58 . 33A act as anti-rotation and / or displacement assurance with respect to the longitudinal axis L of the handle member 12 ,

As a strain relief for the cable 42 It is advantageous if a cable clamp 49 at the fork 50 is provided. The cable clamp 49 For example, at each of the fork arms 51 . 52 provided clamping body, which when assembling the fork arms 51 . 52 for fixing the retaining element 12 at the same time the cable 42 terminals.

The fork arms 51 . 52 are particular to their before the holding section 53 protruding arm portions 60A . 60B reinforced, for example by a rib structure 59 ,

The fork arms 51 . 52 point between the holding section 53 and their free ends 61 bends 62 . 63 between the arm sections 60A . 60B on. The bends 62 . 63 serve preferably to the space between the fork arms 51 . 52 and the range of motion below the fork arms 51 . 52 for the machining head 11 to design optimally.

The bends 62 are opposite to each other in the sense of widening or broadening a distance between the ends 61 , This is especially in the area of the suction hose 26 and the suction connection 23 an increased range of motion between the fork arms 51 . 52 available.

The bends 63 run in the same direction next to each other, but starting from the handle element 12 and with respect to the longitudinal axis L in a sense of the machining head 11 away and to the free ends 61 back to the machining head 11 or the longitudinal axis L, so that in particular for the deflection position A1, approximately corresponding 8th , or a further deflection beyond the deflection position A1 beyond a space BW below the fork arms 51 . 52 for an upper portion of the machining head 11 is available.

At the free ends 61 are configured as bearing mounts bearing elements 64 for bearing shaft parts 65 of the pivot bearing 14 intended. The bearing shaft parts 65 , which are designed, for example, in the manner of bearing bolts are, for example, screws or the like other bolts, which are the bearing mounts of the bearing elements 64 penetrate and designed as a bearing projections bearing elements 68 penetration.

The bearing elements 68 are on a bearing body 75 provided and stand in front of a crossbar 77 of the bearing body 75 in front. The bearing body 75 is designed for example as a kind of bearing shaft or bearing projection. For example, the bearing elements 68 at the respective longitudinal end regions of the traverse 77 intended. Between the traverse 77 and the support body 16 a support bearing section extends 78 which is arcuate, for example.

The support bearing section 78 forms part of the pivot bearing 15 for pivoting about the pivot axis S2. The support bearing section 78 is from a bearing shaft 76 penetrated, in turn, in stock photographs 79 of bearing blocks 79A is taken before the supporting body 16 protrude. The support bearing section 78 is between the bearing blocks 79A arranged. Of course, instead of the bearing shaft 76 Also bearing bolts may be provided, for example, the bearing receivers 79 penetrating in the bearing body 75 in particular are received rotatably. Thus, therefore, the pivot axis S2 is closer to the support body 16 as the pivot axis S1, so that the machining head 11 can pivot about the correspondingly close to the machining plane E located pivot axis S2. The machining head can follow the course of the workpiece surface O comfortably.

With respect to the pivot axis S2, the machining head oscillates or pivots 11 free, with the suction hose 26 and the conduit arrangement 41 dampen or brake the pivoting movement. However, it should be noted that the suction connection 23 is close to the pivot axis S2 and is penetrated by the pivot axis S2, which is the pivoting of the machining head 11 according to the pivot axis S2 accordingly restricts little.

With respect to the pivot axis S1, however, is a positioning spring 70 provided in the machining head 11 acted upon in the base position B. The positioning spring arrangement 70 includes on the bearing elements 64 . 68 directly supported positioning springs 71 . 72 , The positioning spring 71 is the fork arm 51 assigned while the positioning spring 72 the fork arm 52 assigned. The positioning springs 71 . 72 apply the machining head 11 in opposite directions, ie the one positioning spring 71 acts on the machining head 11 for example, with respect to the pivot axis S1 in a clockwise direction, while the other positioning spring 72 the machining head 11 counteracted in the counterclockwise direction. Thus, the machining head becomes 11 with respect to the pivot axis S1, so to speak held in a central position, namely the base position B.

The positioning springs 71 . 72 are with support arms 73 to support shots 67 the bearing elements 64 and support shots 67B at the bearing elements 68 supported. The positioning springs 71 . 72 are, for example, leg springs whose longitudinal ends as support arms 73 are formed.

The bearing elements 68 penetrate the positioning springs 71 . 72 , On the outer circumference of the bearing elements 68 are expediently supporting contours 69 , For example, ribs, provided, at which the positioning springs 71 . 72 can support with their inner circumference. The ribs or supporting contours 69 expediently run parallel to the pivot axis S1. As a result, the mobility of the positioning springs 71 . 72 and the bearing elements 68 especially good for each other.

The positioning springs 71 . 72 are suitably protected and housed. They are advantageous in bearing housings 66 . 74 taken up by the bearing elements 64 . 68 to be provided. For example, the bearing housings 66 . 74 complementary to each other or fit in the manner of sleeves or plug-in elements into each other, to the positioning springs 71 . 72 to live in total. As a result, contaminate the bearing components and in particular the positioning springs 71 . 72 Not. In addition, the risk of injury from any protruding elements, for example, the support arms 73 , low.

The support shots 67 are for example on the bearing housings 66 the bearing elements 64 intended. The support shots 67B are on the bearing housings 74 at the bearing elements 68 intended.

It is understood that also with respect to the pivot axis S2, a positioning spring arrangement can be provided which the machining head 11 to the handle element 12 aligned with respect to the pivot axis S2. Possible, for example, torsion springs, by the bearing shaft 76 are interspersed and on the one hand on bearing blocks 79A and on the other hand, for example, the support bearing portion 78 support. Schematically continue to elastic positioning springs 71A . 72A represented in the form of for example rubber buffers, which are outside the camp 15 on solid structures on the one hand the joint arrangement 13 For example, the support bearing portion 78 , on the other hand, the machining head 11 , For example, the support body 16 support and thus a positioning of the machining head 11 to the handle element 12 effect with respect to the pivot axis S2.

The drive motor 100 is with respect to the articulation area 46 or with respect to the axis of rotation D of the tool holder 19 arranged eccentrically. For power transmission between an output 81 of the drive motor 100 is the transmission 80 intended. The gear 80 For example, an arrangement of a plurality of gears, the speed change, in particular a speed reduction, and / or a force deflection from the output 81 for tool holder 19 cause. In the present case, a purely rotational transmission concept is provided, that is to say the tool holder 19 rotates exclusively about the axis of rotation D. But would also be possible, for example, an eccentric movement eccentric to the axis of rotation D, which is not shown in the drawing and would represent another embodiment. Furthermore, a rotational movement of the tool holder would also be 19 with superimposed eccentric movement easily possible, for example, if a suitable transmission gearbox instead of or in addition to the transmission 80 would be present. Finally, there is a so-called hypercycloal mode of motion of the tool holder 19 also possible by a corresponding gear.

The downforce 81 combs with a gear 82 which is a wave 84 drives with the gear 82 rotatably connected. Furthermore, with the wave 84 a gear 83 rotatably connected, which in turn with a driven wheel 85 combs. The driven wheel 85 is non-rotatable on a shaft 86 arranged at the free end of the tool holder 19 is arranged rotationally fixed.

The arrangement of the gears 82 . 83 . 85 causes a speed reduction and also a force deflection, since the axis of rotation of the output 81 and the wave 86 are not coaxial.

The wave 84 is with warehouses 87 rotatable on the one hand with respect to the carrier body 16 and on the other hand with respect to one with the carrier body 16 connected gear housing 90 stored. The carrier body 16 forms a cover for the gear housing 90 , For example, on the carrier body 16 and the transmission housing 90 bearing mounts 91 for the particular as a rolling bearing, preferably ball bearings, running bearings 87 intended.

The wave 86 is about another camp 87 with respect to the carrier body 16 and a warehouse 88 in a warehouse 92 of the bearing housing 90 is included, with respect to the bearing housing 90 rotatably mounted. Thus, the respective longitudinal end portions of the shafts 86 . 84 mounted with pivot bearings on a protective housing.

The gearbox 90 has a plate 96 on, at which the bearing shots 91 . 92 are provided. The camp recording 92 is at her tool holder 19 facing bottom with a bearing retainer 92 surrounding sealing edge 93 provided so that the gearbox 90 The gear 80 from the bottom tightly encapsulates. The warehouse 88 lies on the edge of the seal 93 with, for example, an additional seal dustproof.

The upper-side encapsulation of the gearbox 80 is suitably by the support body 16 realized. The supporting body 16 has, for example, in the drawing not visible plug-in receptacles, in which plug-in projections or screw domes 95 of the gearbox 90 intervene from below. A border area 97 of the gearbox 90 For example, it is provided with a seal so that it is at a sealing area 98 , For example, a sealing edge of the support body 16 tight.

The supporting body 16 So contributes to the encapsulation of the transmission 80 at. At the top, it seals the gearbox 80 almost completely off, except for a motor mount 89 in which the drive motor 100 is included. The supporting body 16 forms, for example, a housing part of the transmission housing 80 , in particular a housing shell.

In front of the supporting body 16 stand supporting projections 99 , For example, arms, laterally in front, for example, four support projections 99 , on each of which bolt receptacles or mounting receptacles 94 for mounting mounting elements 94B for connection to the cover 21 protrude.

On the gearbox 90 is also the suction port 23 intended. The suction connection 23 stands in front of the supporting body 16 laterally in front.

The drive motor 100 is similar to the gearbox 80 optimally protected against dust, which becomes clear below. The drive motor 100 has, for example, a rotor 101 on that in a stator 110 is included. The drive motor 100 is a brushless, electronically commutated motor powered by the lighting device 40 is currentable.

The rotor 101 includes a motor shaft 102 on which a laminated core 103 is arranged. In front of the laminated core 103 projecting longitudinal ends of the motor shaft 102 are with an engine mount 104 and an output bearing 105 , For example, roller bearings and / or plain bearings, with respect to the stator 110 rotatably mounted.

At a free end of the motor shaft 102 , eg engine mounts 104 , is a fan bracket 108 to hold a fan 109 intended.

A fan 109 and the tool holder 19 are on opposite sides of the drive motor 100 arranged.

The fan wheel 109 realizes a pressure ventilation, ie air is through the inlet opening 25 through the fan 109 sucked in, so to speak, flows through the stator 110 and enters the fan wheel 109 opposite side of the stator 110 , in the area of the output bearing 105 , from the stator 110 off and continues to the air outlet area 18 ,

The stator 110 includes a stator body 111 standing at a bearing cap 125A a camp recording 112 in which the engine mount 104 is included. The motor shaft 102 penetrates, for example, a passage opening 113 of the stator 110 and is with an end portion on the engine mount 104 held. The bearing cap 125A is for example with the stator body 111 integrally, but could also as from the stator body 111 releasably connected component be designed, such as the later explained bearing cap 125 ,

Next to the opening 113 is a lead 114 provided in a groove 106 on the rotor 101 , for example, on the laminated core 103 , engages. This creates a certain labyrinth structure, the tightness of the drive motor 100 contributes. The laminated core 103 is in a rotor mount 115 of the stator body 111 added.

The stator body 111 consists for example of a plastic material. On straps 116 of the stator body 111 are coils 121 an exciting coil arrangement 120 arranged. Radially outside on the straps 116 extends a peripheral wall 117 , For example, of plastic material, the stator 110 ,

A base of the carriers 116 For example, the material of a laminated core 111B formed with the plastic material to form the stator body 111 is overmoulded.

The exciting coil arrangement 120 has connections 122 . 123 such as 124 on, which are electrically connected to the conductors L1, L2, L3. The connections 122 - 124 are phases P1, P2 and P3 of the exciting coil arrangement 120 assigned. The connections 122 - 124 are for example on a front side of the stator body 111 , in particular the peripheral wall 117 arranged.

The rotor mount 115 is through a bearing cap 125 closed in the motor housing 24 can be integrated. The bearing cap 125 has, for example, a bottom wall 133 on, from which a locking projection 126 for closing the rotor receptacle 115 protrudes. The locking projection 126 has a lead 127 up in a groove 107 of the rotor 101 , namely on the laminated core 103 , engages. This is a labyrinthine seal or labyrinth seals 118 realized. The projections 114 . 127 For example, are annular projections, while the grooves 106 . 107 Ring grooves are. The grooves 106 . 107 are for example at opposite end faces of the laminated core 103 intended.

The bottom wall 133 and the locking projection 126 seal the drive motor 100 on its front side at the engine mount 105 from. Also a wall 17 of the gearbox 80 , for example, a part of the support body 16 can be one forms the drive motor 100 front-closing wall.

In the area of the locking projection 126 is still a recording 128 for a bearing receiving element 130 arranged. The bearing receiving element 130 has a bearing receiver 131 for the output bearing 105 on. The bearing receiving element 130 is for example in a thread 129 the recording 128 screwed or with appropriate locking contours in the recording 128 locked. In the bearing receiving element 130 is still a gasket 132 or another sealing element. The sealing washer 132 keeps the output bearing 105 in the warehouse 131 ,

Between the carriers 116 of the stator body 111 and thus between the coils 121 are cooling channels 119 provided by the cooling air K the stator 110 and thus the exciting coil assembly 120 can flow through. The cooling air K flows at one of the tool holder 19 opposite side of the drive motor 100 in the cooling channels 119 on and at the tool holder 19 facing side of the drive motor 100 from the cooling channels 119 out. There she is through a bottom wall 133 of the bearing cap 125 deflected radially outward and flows through a flow space 134 to a peripheral wall 135 of the lid 130 at the air outlet area 18 is provided. For example, on the peripheral wall 135 ribs 136 provided, between which distances or outflow openings 137 are present, through which the cooling air K from the motor housing 24 can flow out. The flow space 134 is between the peripheral wall 135 and the peripheral wall 117 intended. Between the peripheral wall 117 and the peripheral wall 135 extend advantageous support ribs or retaining walls 138 , At the supporting walls 138 are advantageous ladder recordings 139 for receiving or holding the lines L1, L2 and L3 provided.

The cable 42 is over an inlet 140 on the peripheral wall 135 in the flow space 134 introduced. Out of the cable 42 the individual lines L1, L2 and L3 are led out and on the support walls 138 namely, the conductor shots 139 , held and with the connections 122 - 124 the exciting coil assembly 120 connected.

In 11 it becomes clear that the bottom wall 133 above the carrier body 16 runs and the peripheral wall 135 in front of the carrier body, so to speak 16 protrudes. The peripheral wall 135 is at its upper end 141 with a sealing contour 142 provided with a corresponding sealing contour 143 a peripheral wall 144 of the motor housing 24 engaged. Thus, a substantially dust-tight connection between the motor housing 24 and the bearing cap 125 given.

In the motor housing 24 is a flow housing or air guide body 145 taken up, which is about the drive motor 100 extends. For example, the air guide body 145 a wall 146 that have an air ducting area 147 around the drive motor 100 limited. The wall 146 is designed for example as a kind of air guide sleeve and / or peripheral wall and / or as a flow housing. Through the air guidance area 147 , which may also have channels, flows in any case, the cooling air K on the outer circumference of the stator 110 along and cool this. The wall 146 is for example in the area of the fan wheel 109 cylindrical and stands up to the fan 109 in front.

The wall 146 So contributes to fan blades 109A of the fan wheel 109 the cooling air K particularly effective to the drive motor 100 or the stator 110 and the rotor 101 so to speak expresses.

The air guide body 145 has at his from the fan 109 distant longitudinal end region (with respect to a longitudinal axis of the motor shaft 102 ) radially with respect to the motor shaft 102 from the wall 146 outwardly extending end wall sections 146A and 146B that are above the air outlet area 18 run and so the cooling air K radially outward from the motor housing 24 to steer.

It is preferably provided that the drive motor 100 is electromagnetically shielded. For example, the air guide body 145 be designed as an electromagnetic shielding housing. For this purpose, there is the air guide body 145 for example, made of metal or has a metallic component. But also the motor housing 24 may be in an advantageous embodiment of the invention, electromagnetic shielding, for example, be provided with an electrically conductive protective film or protective layer.

Advantageously, the lines L1-L3 in the cable 42 in an electromagnetic shield 177 , in particular a network led. The shield 177 is preferably grounded. Electromagnetic compatibility of the drive motor 100 and the hand-held power tool ten adds when the shield 177 with drive motor 100 is conductively connected, for example, with the stator 110 , in particular the laminated core 111B , At this the shielding can 177 For example, be applied by a spring conductive.

The motor housing 24 points in the area of the air inlet or the inlet opening 25 a projection wall 148 as well as a cover wall 149 on. The top wall 149 covers the engine case, so to speak 24 from above, but on the top wall 149 Air outlets or air inlets 150 for the cooling air K are present.

In the area of the top wall 149 is a recording 151 for a filter element 152 provided in the recording 151 is used. For example, the recording 151 from the inner periphery of the protrusion wall 148 limited. The filter element 152 has, for example, a filter fabric 154 or any other close-meshed filter structure located above the air inlets 150 is arranged. Thus, contaminants, such as dusts or the like, contained in the cooling air K, through the filter element 152 filtered.

The filter element 152 is suitably based on locking means 153 , For example, comprising a resilient detent or the like, on the motor housing 24 locked. The locking means 153 form components of a holder 153A ,

At an upper, free end area of the motor housing 24 is a recording 155 for a protective body 156 intended. While the engine case 24 Made of a relatively hard plastic, giving it an optimal protective effect for the drive motor 100 can unfold is the protective body 156 comparatively flexible or elastic. The protective body 156 is designed for example in the manner of a clasp. The protective body 156 Bounces shocks on the machining head 11 can act and thus in principle the drive motor 100 would damage, optimally off.

It is preferred if the protective body 156 flexible in bending. The protective body 156 Although in itself horseshoe-shaped or U-shaped, but can be bent. Thus, it is possible, for example, arranged at its free end portions retaining seats 158 in retaining projections 159 of the motor housing 24 to mount, so to speak. It is advantageous if the protective body 156 to which still further retaining contours has, for example, a retaining projection 158A which runs along a side edge and in a corresponding, for example U-shaped, holding receptacle 159A of the motor housing 24 can be hooked.

The drive motor 100 is with a protection circuit 160 provided on site, namely at the machining head 11 , the drive motor 100 protects against overheating or other damage.

The protection circuit 160 has, for example, a circuit breaker 161 on. In principle it would be possible to use the circuit breaker 161 directly into the motor housing or at least the stator 110 of the drive motor 100 to integrate. In the present case, however, an assembly-friendly, easily retrofittable or replaceable concept is chosen in which the circuit breaker 161 outside the stator 110 , but is arranged in direct contact with this.

The circuit breaker 161 comprises a thermally actuated switch or is formed thereby, wherein the thermally actuable switch at a heating of the stator 110 goes beyond a predetermined temperature addition in a disconnected position, but otherwise assumes a connection position. In the connecting position, the disconnector connects 161 the conductor L1 with the one phase of the exciting coil assembly 120 associated port 122 while in the disconnected position, the conductor L1 of connection 122 and thus the phase P1 of the exciting coil assembly 120 separates.

The circuit breaker 161 is suitably in a protective housing 162 arranged, which is a housing part 163A and a housing part 163B having. The protective housing 162 the breaker 161 expediently completely. It would be possible that as in 13 represented the protective housing 162 open at its top, allowing air to disconnect 161 can get. However, the protective housing is preferred 163 completely closed, leaving the circuit breaker 161 particularly sensitive and can respond quickly to temperature changes, especially too high temperatures.

The protective housing 162 for example, limits a shot 164 , for example, a chamber in which the circuit breaker 161 is arranged. The housing parts 163A . 163B For example, they are locked together, for which Rastkonturen 165 available.

The housing part 163B forms a thermal insulator, which is the disconnector 161 from external heat influence on the drive motor 100 protects, so the circuit breaker 161 is not mis-actuated by such heat influence.

The housing part 163A however, is thermally conductive, so from the stator 110 coming heat the disconnector 161 can operate. An advantageous measure is it, if in addition still a heat conducting element 169 is arranged, for example, a so-called heat conduction pad, which heat from the stator 110 in the direction of the protective housing 162 and thus to the circuit breaker 161 passes.

The heat-conducting element 169 preferably has a geometry and areal extent, that of the geometry and areal extent of the stator 110 facing end face of the protective housing 162 equivalent.

The heat-conducting element 169 also compensates for unevenness of the protective housing 162 and / or the stator 110 from what advantageous the heat transfer from the stator 110 to the circuit breaker 161 improved.

A further advantageous measure provides that a spring 168 , So a spring arrangement, is provided to the circuit breaker 161 in the direction of the stator 110 to charge. The feather 168 is for example on the housing part 163B arranged, in particular its front wall.

Laterally on the protective housing 162 are ladder outlets 166 for a portion L1A of the conductor L1 and one with the terminal 122 connected conductor portion L1B provided.

The circuit breaker 161 Advantageously, the housing encapsulating it 161B in which its electromechanical components, in particular a bimetal strip 161C , electrical contacts and the like, are electrically insulated housed. The housing 161B is preferably dustproof. The housing 161B has, for example, electrical contacts for connecting the conductor sections L1A and L1B. When exposed to heat or cold, the bimetallic strip moves 161C between the in 10 schematically drawn positions back and forth, where he establishes or separates an electrical connection.

When the circuit breaker 161 goes into its disconnected position, no electricity flows through the lines L1. This may be the current monitoring device 171 the energizing device 40 determine and send to the controller 170 Report. The control 170 then switches the total energizing device 40 from the way that no more current flows through the lines L1-L3. Thus, so to speak, the controller detects 170 decentralized a fault on the drive motor 100 , There is only the circuit breaker 161 as a safety measure required. In this way, for example, data transmission lines are saved, otherwise from the processing head 11 over the handle element 12 for controlling 140 would have to be led. The control 170 preferably operates sensorless, ie without one from the drive motor 100 forth coming angle of rotation information of a rotary angle sensor arranged there.

Of course, it is basically possible that, for example, a rotation angle sensor 174 on the drive motor 100 is arranged, which is the respective rotational angle position or speed of the rotor 101 recorded and via a data line 176 , preferably in the handle element 12 runs (in 13 indicated schematically), to the controller 170 reports. In this way it is also possible that the controller 170 a respective rotational angular position of the rotor 101 evaluates and based on this at least one rotation angle information, the field coil assembly 120 energized.

It is understood that other or additional circuit breaker in the drive motor 100 may be advantageous, such as a current flow on the line L2 detecting the power switch 175 which at a current flow which is above a predetermined current value, the line L2 separates from the phase P2. Without further ado it would be possible that the power switch 175 in series with the disconnector 161 is arranged for example on the line L1.

The handle bar or the handle element 12 is in the embodiment according to 1 - 15 in one piece, that is, for example, even the channel bodies 33 . 36 Components of a total continuous tubular body can be.

But readily a multi-part handle element is possible, which is based on the 16 - 18 becomes clear. For example, instead of the channel body 33 a two-part channel body 233 be provided. The channel body 233 has segments, for example 234 . 235 on. The segments 234 . 235 can be solved, for example, from each other ( 16 ).

In the segments 234 . 235 runs the flow channel 34 ,

At one end 236 of the segment 35 is for example the cable 42 from the channel body 233 led out.

The cable 42 comprises the lines L1-L3, ie a total of three live lines running along the channel body 233 to the energizing device 40 lead and at the separation point between the segments 234 and 235 detachably connectable to each other.

The segments 234 . 235 are detachably connectable to each other so that they are separated from the in 16 illustrated separate position in a in 17 represented interconnected position can be brought. For releasably connecting the segments 234 . 235 serves a connection device 240 , The connection device 240 for example, includes one on the segment 235 provided connection projection 241 for example, blunt with a connecting projection 242 on the segment 234 is connectable. Then there is a continuous flow channel 34 realized. The flow channel 34 namely passes through the plug-in projection 241 and the plug-in receptacle 242 therethrough.

Alternatively or additionally, a plug connection is possible, that is, for example, the connection projection 241 a male projection and the connecting projection 242 have a plug-in receptacle which are inserted into one another.

The connection device 240 further comprises retaining means in the form of movable on the segment 234 stored holders 243 with holding shots or retaining tabs 244 on the segment 235 can be brought into engagement. The holders 243 are for example at warehouses 245 pivotally mounted, so that they from the retaining projections 244 away and thus can be pivoted out of engagement with these.

It is preferred if the holding projections 244 in recesses or other holding fixtures on the segment 234 can intervene. Thus, there is an additional positive fit between the segments 234 . 235 realized.

For the electrical connection between the segments 234 . 235 serve electrical contact arrangements 250 . 260 which are releasably connectable to each other. The contact arrangement 250 includes, for example, contacts 251 . 252 . 253 assigned to and connected to the conductors L1-L3. For example, the contacts 251 - 253 on a contact carrier 254 arranged, in particular in depressions or otherwise mechanically protected. The contact carrier 254 is designed for example in the manner of a projection or comb-like.

The contact arrangement 260 includes corresponding contacts 261 - 263 , which are also associated with the lines or conductors L1-L3. The contact arrangement 260 is on a contact carrier 264 arranged, which by means of a pivot bearing 265 swiveling on the segment 234 is stored. For example, the contact carrier 264 with the holder 243 of the segment 234 in one piece or motion coupled. Thus, the contacts 261 - 263 from the contacts 251 - 254 be pivoted away for electrical separation or for electrical connection to this.

A holding shot 266 on the contact carrier 264 can additionally secure this connection between the segments 234 . 235 or the contacts 261 - 263 with the contacts 251 - 254 in engagement with a retaining projection 256 on the segment 235 to be brought.

The connection between the segments 234 and 235 can be secured by additional locking means, screw means or the like.

One recognizes in this context the advantage of the protection concept with the protection circuit 160 and the circuit breaker 161 , because namely the contact arrangements 250 and 260 only in total 3 Contact pairs, namely for the lines L1, L2 and L3, need.

According to a concept which is advantageous not only in the concrete exemplary embodiment, it is provided that an inflow opening for a cooling air flow and a tool receptacle (present 19 ) having machining side BS on opposite sides, in particular end faces, of a motor housing (here 25 ) or a machine housing are arranged.

An outflow direction for the cooling air flow K expediently runs transversely to the processing plane E.

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• DE 102007012394 A1 [0002]

Claims (15)

Hand machine tool, in particular grinding machine, with one in a motor housing ( 24 ) arranged electric drive motor ( 100 ) for driving one to hold a machining tool ( 20 ) tool holder ( 19 ), wherein the drive motor ( 100 ) a stator ( 110 ) with an excitation coil arrangement ( 120 ) and a rotor ( 101 ) with a motor shaft ( 102 ), which has an output ( 81 ) for driving the tool holder ( 19 ), wherein a fan ( 109 ) with the motor shaft ( 102 ) is rotatably connected or rotationally coupled, wherein the motor shaft ( 102 ) at their longitudinal end regions with one in the region of the output ( 81 ) arranged output bearing ( 105 ) and arranged at the other longitudinal end region engine mounts ( 104 ) with respect to the stator ( 110 ) is rotatably mounted, characterized in that the excitation coil arrangement ( 120 ) between the fan wheel ( 109 ) and the downforce ( 81 ) of the motor shaft ( 102 ) is arranged and the fan ( 109 ) for generating a drive motor ( 100 ) from the fan wheel ( 109 ) to the output ( 81 ) flowing through the cooling air flow (K) is configured. Hand machine tool according to one of the preceding claims, characterized in that the output ( 81 ) for driving the tool holder ( 19 ) with a transmission ( 80 ) is rotatably coupled, which the tool holder ( 19 ) drives. Hand machine tool according to claim 2, characterized in that the transmission ( 80 ) in an encapsulated, in particular dust-tight, transmission housing ( 90 ) is arranged and / or that in particular a component of a transmission housing ( 90 ) of the transmission ( 80 ) forming wall ( 133 . 17 ) between the gearbox ( 80 ) and the stator ( 110 ) of the drive motor ( 100 ) is arranged and with respect to the cooling air flow (K) is tight and / or that between the transmission ( 80 ), in particular its transmission housing ( 90 ), and the drive motor ( 100 ) no distance and / or no fan is present and / or that the output ( 81 ) of the drive motor ( 100 ) a drive wheel of the transmission ( 80 ). Hand machine tool according to one of the preceding claims, characterized in that on one of the motor shaft ( 102 ), in particular provided by a cover or bearing cap, the end wall of the motor housing ( 24 ) no passage opening for the cooling air flow (K) is arranged and / or the motor housing ( 24 ) on its outer periphery, in particular in the region of a lid arranged outflow openings ( 137 ) for the cooling air flow (K). Hand machine tool according to one of the preceding claims, characterized in that the motor housing ( 24 ), in particular exclusively, between the output bearing ( 105 ) and the exciting coil arrangement ( 120 ) arranged outflow openings ( 137 ) for the cooling air flow (K) and / or that on the motor housing ( 24 ), in particular a cover or bearing cap ( 125 ) of the motor housing ( 24 ), arranged outflow openings ( 137 ) a distance to an outer periphery of the stator ( 110 ), which is at least half a radius, preferably approximately a whole radius, of the outer circumference of the stator ( 110 ) to the motor shaft ( 102 ) corresponds. Hand machine tool according to one of the preceding claims, characterized in that at least one outflow opening ( 137 ) or all outlets ( 137 ) for the outflow of the cooling air flow (K) radially with respect to the motor shaft ( 102 ) are arranged and / or configured. Hand machine tool according to one of the preceding claims, characterized in that at least one outflow opening ( 137 ) or all outlets ( 137 ) for the outflow of the cooling air flow (K) into a working area (AB) of the handheld power tool, in particular in the working direction (AR) at the front and / or laterally to a working direction (AR) of the hand-held power tool ( 10 ), so that from the at least one outflow opening ( 137 ) flowing cooling air flow (K) the work area (AB) at least partially freely blows. Hand machine tool according to one of the preceding claims, characterized in that the motor shaft ( 102 ) solely on the basis of the engine mount ( 104 ) and the output bearing ( 105 ) and / or is mounted on exactly two bearings and / or for the fan ( 109 ) no separate warehouse is provided. Hand machine tool according to one of the preceding claims, characterized in that the rotor ( 101 ) in a rotor receptacle ( 115 ) of the stator ( 110 ), wherein the rotor receptacle ( 115 ) on at least one longitudinal end region of the motor shaft ( 102 ), preferably both longitudinal end portions of the motor shaft ( 102 ), is dust-tight and / or sealed from the environment and / or between the rotor ( 101 ) and the stator ( 110 ) a labyrinth seal ( 118 ) is provided. Hand machine tool according to one of the preceding claims, characterized in that the output bearing ( 105 ) and / or the engine mount ( 104 ) on a bearing cap ( 125 . 125A ) are arranged, wherein the bearing cap ( 125 . 125A ) and / or each of the bearing cap ( 125 . 125A ) held output bearings ( 105 ) or engine mounts ( 104 ) a rotor receptacle ( 115 ) of the stator ( 110 ), in which the rotor is accommodated, in particular dust-tight, closes. Hand machine tool according to one of the preceding claims, characterized in that the output bearing ( 105 ) and / or the engine mount ( 104 ) are designed as sealed or dust-tight bearings and / or that the output bearing ( 105 ) and / or the engine mount ( 104 ) one the rotor ( 101 ) receiving rotor receptacle ( 115 ) of the stator ( 110 ) tight, in particular dust-tight, closes. Hand machine tool according to one of the preceding claims, characterized in that the motor housing ( 24 ) in the area of the fan wheel ( 109 ) an inflow opening ( 25 ), at which an inlet grille and / or a holder ( 153A ) for releasably holding a filter element ( 152 ) arranged to filter from the inlet opening ( 25 ) is provided by flowing air. Hand machine tool according to one of the preceding claims, characterized in that the holder ( 153A ) a retaining clip and / or latching means ( 153 ) for locking with the motor housing ( 24 ). Hand machine tool according to one of the preceding claims, characterized in that the motor housing ( 24 ) a machine housing of the hand-held machine tool ( 10 ), in particular a processing head ( 11 ) of the hand machine tool ( 10 ), and / or that in the motor housing ( 24 ) a flow housing and / or air guide body ( 145 ) is arranged to guide the cooling air flow (K). Hand machine tool according to one of the preceding claims, characterized in that a the fan ( 109 ) upstream inlet opening ( 25 ) of the motor housing ( 24 ) and a tool holder ( 19 ) machining side (BS) on opposite sides of the motor housing ( 24 ) are arranged and / or a longitudinal extent of the motor housing ( 24 ) at an angle, in particular at right angles, to a working plane (E) of the machining tool ( 20 ) runs.

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